{
  "step": "C419",
  "status": "completed",
  "date": "2026-09-24",
  "title": "Fixed Mirror tests of the five-station 2K profile",
  "previous_certificate_sha256": "41882e2cf6620030031c70a4bb86e1ed9ab3bc5b98a662f62f038a5b48c1f50b",
  "bindings": {
    "step": "STEP.json",
    "source_manifest": "SOURCE_MANIFEST.json",
    "report": "490d_C419_Fixed_Mirror_Tests_of_the_Five_Station_2K_Profile_20260924.md",
    "checkpoint": "490d_Mirror_Checkpoint_After_C419_20260924.md",
    "data": "evidence/DATA.json",
    "results": "evidence/RESULTS.json",
    "calculation": "evidence/CALCULATION.py",
    "verifier": "evidence/check.py",
    "next_step_decision": "NEXT_STEP_DECISION.json",
    "replay": "REPLAY.json",
    "control_integrity": "CONTROL_INTEGRITY.json",
    "readme": "README.md"
  },
  "step_sha256": "81ff59b8fe49905a7f328c9f2fd6a88c4bbcd7dcdf47a94aadacd57baf9f0b55",
  "source_manifest_sha256": "76716fc88cfc633958d87488abefb0960abb5ad2e52bbac8e3c1b1234deda9b9",
  "report_sha256": "f7638a82d3c43f9c6a25268ecc730ee5f189c6cdb892b8bdcbd0ab1e700bf209",
  "checkpoint_sha256": "c3b4b5641b6963608abb0f9e646678b5c941828df5e267724b9ad259a67c75a1",
  "data_sha256": "fe8e61e43d425e8e22f4a0f7511418966cf38fe5a175c74da5651b6faa9efe57",
  "results_sha256": "fe326f0c3056400dc3a86c576807097e312d9eea449e2360850f1a3542f064a5",
  "calculation_sha256": "881e1af36dfa18a6215bdf5100015b75bc7c0658543869fcd8d0c96df4cdc08e",
  "verifier_sha256": "9f175670abb70f7819dd7f6d997ff0bef2e58df8dffd763b433f6c6cd62e332d",
  "next_step_decision_sha256": "477244860164c03fa96eba0d9f3262add61754e09494e3a06fb02e502ccd75a3",
  "replay_sha256": "1a3fe3b03fe3c174d7c68b446baeb463ef947b0a894a38c0f3125eeacd0df36a",
  "control_integrity_sha256": "9810807cb07b02f43f568f68bb82cb41a6eeff6799902254b4932e5c350ac838",
  "readme_sha256": "70556adc0171f33dd80f96f056b7c0e74e0212e27c404646bd89ccd6a89a8861",
  "assertions_passed": 32,
  "source_checks_passed": 16,
  "main_result": "Five new2K station pairs × six sourced cumulative2K Shem/Flood pairs give30 joins, none with17K cross-spans. All ten required role-specific cumulative endpoints are absent. The inherited C=−2639/−2635 corner exchanges give zero sourced images in20 slots. The coherent2K person profile remains separate from the original2K/17K joins; no newaxis is fitted.",
  "limits": "The absence results are relative to the frozen48-record cumulative menu and two already admitted exchanges. They do not exclude other authorized future source work. No new pivot, endpoint, phase or global axis is admitted.",
  "canonical_or_graph_edits": false,
  "new_independent_agent_review": false,
  "review_provenance": "Root-agent analysis and deterministic replay; no new independent-agent review",
  "next_proposed_step": "At each of the five established upper stations, hold that existing coordinate and apply E, E², P and J to its paired lower station. Test every exact output against the frozen regular source menu, keeping source membership, boundary identity and missing intermediate points explicit.",
  "next_step_executed": false
}